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Published on: February 11, 2019
Approaches for increasing the solution stability of proteins
M C Manning1, J E Matsuura, B S Kendrick
1Cooperative Program in Pharmaceutical Biotechnology and Department of Pharmaceutical Sciences, School of Pharmacy, Campus Box C238, University of Colorado Health Sciences Center, Denver, Colorado 80262.
Biotechnology and Bioengineering
|December 5, 1995
Summary
Protein stabilization is crucial for pharmaceuticals. Additives enhance thermal stability by preventing denaturation and aggregation, while hydrophobic ion pairing (HIP) improves solubility in organic solvents and enables selective protein precipitation.
Area of Science:
- Pharmaceutical Science
- Protein Chemistry
- Biotechnology
Background:
- Protein formulation and stabilization are critical challenges in the pharmaceutical industry.
- Protein denaturation and aggregation can compromise drug efficacy and safety.
- Developing effective strategies for protein stabilization is essential for therapeutic applications.
Purpose of the Study:
- To explore two distinct methods for enhancing protein stability in pharmaceutical formulations.
- To investigate the impact of additives on the thermal denaturation and aggregation of urokinase.
- To evaluate the efficacy of hydrophobic ion pairing (HIP) for protein stabilization and selective precipitation.
Main Methods:
- Studied the effect of additives on thermally induced denaturation and aggregation of low molecular weight urokinase.
- Investigated hydrophobic ion pairing (HIP) by replacing polar counter ions with anionic detergents.
- Assessed the solubility of HIP complexes in organic solvents and their thermal denaturation temperatures.
- Demonstrated selective precipitation of basic proteins from mixtures using HIP.
Main Results:
- Additives increased protein thermal stability by preferential exclusion, reducing denaturation and subsequent aggregation.
- Hydrophobic ion pairing (HIP) complexes exhibited enhanced solubility in organic solvents.
- HIP complexes showed significantly higher thermal denaturation temperatures in organic solvents compared to aqueous solutions.
- HIP enabled highly selective precipitation of basic proteins (selectivity > 2000-fold) from complex mixtures.
Conclusions:
- Additives offer a viable strategy for enhancing protein stability by mitigating denaturation and aggregation.
- Hydrophobic ion pairing (HIP) is an effective technique for improving protein solubility in organic media and achieving selective precipitation.
- These formulation approaches hold promise for developing more stable and processable protein-based therapeutics.
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